Examples of everything
Whether a person classifies him or herself as a political, conservative moderate, or liberal
Categorical
Whether a toliet baper roll is hung so that the paper comes out over the top or underneath
Categorical (binary)
what is the observational unit in this question
The nellie mae organization conducts an extensive annual study of credit card usage of college students
The owners of a sports stadium wanted to predict what additional refreshment options would sell well. They selected 80 seat numbers at random and surveyed the occupants of those seats.
The population is the occupants of all seats in the sports stadium; the sample is the occupants of the 80 selected seats.
is this a variable or not- what is your eye color?
Yes it is a variable
Whether or not you have a credit card
categorical (binary)
is this a variable or not- do men have to wait longer in the waiting room vs women
not a variable
How many hours have you slept the past 24 hours
quantatative
Ratio of backpack weight to body weight of college student
quantatative
how many states you visited
quantatative
A safety inspector conducts air quality tests on a randomly selected group of 7 classrooms at an elementary school. what is population and sample
sample: 7 population: classrooms at elementary school
A pediatrician randomly selected 10 parents of his patients. Then he surveyed the parents about their opinions of different kinds of diapers. what is population and sample
sample:10 parents of patients population: parents of pediatricians patients
A quality control engineer is curious about the thickness of paint on a car at her factory. She randomly selects 30 points on the car and measures the paint thickness at each of those points. what is population and sample
sample:30 Population: The population is every possible point on the car
what is the observational unit in this question
suppose you want to investigate whether or not students who sit closer to teacher tend to score higher on quizzes then students who sit further away
is this a variable or not- what is your blood type?
yes it is a variable you can ask everyone their blood type
is this a variable or not- What is your waiting time
yes this is a variable
